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On the Origin of Gamma-Ray Flares from Bright Fermi Blazars

2021; Institute of Physics; Volume: 257; Issue: 2 Linguagem: Inglês

10.3847/1538-4365/ac365d

1538-4365

Vaidehi S. Paliya, M. Böttcher, Mark Gurwell, C. S. Stalin,

Dark Matter and Cosmic Phenomena

Abstract The origin of γ -ray flares observed from blazars is one of the major mysteries in jet physics. We have attempted to address this problem following a novel spectral energy distribution (SED) fitting technique that explored the flaring patterns identified in the broadband SEDs of two γ -ray bright blazars, 3C 279 ( z = 0.54) and 3C 454.3 ( z = 0.86), using near-simultaneous radio-to- γ -ray observations. For both sources, the γ -ray flux strongly correlates with the separation of the SED peaks and the Compton dominance. We propose that spectral hardening of the radiating electron population and/or enhancement of the Doppler factor can naturally explain these observations. In both cases, magnetic reconnection may play a pivotal role in powering the luminous γ -ray flares.